Make TracingImpl take a Shell* and args, instead of an ApplicationImpl*.

services/gfx/compositor/compositor_app.cc

Index: services/gfx/compositor/compositor_app.cc
diff --git a/services/gfx/compositor/compositor_app.cc b/services/gfx/compositor/compositor_app.cc
index 8c28965b6aa016501661d3ecb04fc888fbeddc27..bd05c8af324ab4dc8c269084efc1e3f63f96a021 100644
--- a/services/gfx/compositor/compositor_app.cc
+++ b/services/gfx/compositor/compositor_app.cc
@@ -29,7 +29,7 @@ void CompositorApp::Initialize(mojo::ApplicationImpl* app_impl) {
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
 
-  tracing_.Initialize(app_impl_);
+  tracing_.Initialize(app_impl_->shell(), &app_impl_->args());
 
   engine_.reset(new CompositorEngine());
 }